CVE-2026-63000

REDAXO is a PHP-based content management system. Prior to 5.21.2, rex_api_install_package_update in redaxo/src/addons/install/lib/api/api_package_update.php inherits the false default from rex_api_function::requiresCsrfProtection() instead of requiring a CSRF token. An unauthenticated attacker can cause a logged-in administrator's browser to request a selected package update from the configured REDAXO package server, changing installed addon code or disrupting the site without the administrator's intent. This issue is fixed in version 5.21.2.

• https://github.com/redaxo/core/commit/a13abbffbad4fdea46a4edc86cdba3335ca9e8f3Patch
• https://github.com/redaxo/core/pull/6579Issue Tracking
• https://github.com/redaxo/core/releases/tag/5.21.2Release Notes
• https://github.com/redaxo/core/security/advisories/GHSA-m8r3-22v6-g877Exploit
• https://github.com/redaxo/core/security/advisories/GHSA-m8r3-22v6-g877Exploit